Air control for oil burners



Elem 22", 19316. H. HsBERRYMAN AIR CONTROL. FOR OILLBURNERS Filed Apgsilj 29%, 1955 Patented BecrZZ, 1936 ETED STATES,

PATENT oFricE AIR CONTROL FOR OIL BURNERS Harry B. Berryman, Ehnhurst, Ill.

Application April 29, 1935, Serial No. 18,825

3 Claims. (01. 158-15) This invention relates to an air control particularly adapted for oil burners of the high pressure gun type such as are commonly used for the heating of buildings. It is designed for attachment to existing oil burner installations;

it involves no moving parts; it is readily adjustable for regulating the nature and character of the flame produced; and when adjusted to best advantage it will produce a flame which is clean,

hot and free from odor. n

These and other objects of my invention are realized by the construction exemplified in the accompanying drawing wherein- Figure 1 is a longitudinal section through the air conduit of a gun type of oil burner;

Fig. 2 is a transverse section on line 2--2 of Fig. 1; and

Fig. 3 is an end elevation of the cone at the open end of the conduit.

I have confined the showing in the drawing to the parts of a high pressure gun type of burner that. cooperate with the features of construction hereinafter claimed as my invention. As indicated, there is a cylindrical conduit C receiving air from a blower within a housing H. One end of the conduit is closed by a head plate P adapted to be secured in position by any appropriate means as, for example, the latch L. Through the head plate is extended a fuel pipe F having a 39 connection at its outer end with the pipe 5 leading to an oil supply source. .The pipe extends through the conduit for substantially its entire length, being equipped at its delivery end with an atomizing nozzle N through which liquid fuel is discharged.

In addition to the support afforded by the head plate, the fuel pipe is maintained in an axial position within the conduit with the aid of a hub l0 from which radiate a series of air deflecting 4 vanes II all pitched in one direction. These vanes are joined to the hub as by means of webs l2 (see Fig. 2). The extremities of the vanes lie close to the inner surface of the conduit, thereby assuring a radial support for the fuel pipe extending therewithin. The position of the vanes lengthwise of the conduit is fixed as by a set screw H: which holds the hub at a selected point of adjustment lengthwise of the fuel pipe. Formed in two of the blades are'bearings I6 each accommodating an insulating bushing 11 surrounding an electrode I8. These two electrodes have their igniting points close to the atomizing nozzle at the end of the fuel pipe. Flexible connections l9 extend from the electrodes through a bushing 20 in a wall of the conduit to a source of electrical current. With the circuit closed the electrodes are effective to ignite given a whirling motion which continues through to the discharge end of theconduit. At this point I arrange a cylinder A formed to fit sliding- 10 1y within the conduit. The walls of the cylinder at its outer end are inwardly inclined at 25 in the form of a truncated cone. An elongated fiat bar 26 is connected with a base 21 extending inwardly from the cylinder. The bar which rests 15 upon the lower wall of the conduit extends interiorly thereof to a point close to the head plate where it is secured as by means of a cap screw 28 extending from the bar through a slot 29 in the wall of the conduit. The bar, together with 20 the cylinder at its end, may be adjusted lengthwise of the conduit to desired position where it is then locked by the cap screw.

The interior of the cylinder-cone is provided with a series of peripheral air deflecting vanes 25 30 pitched in opposition to the vanes H. These outer vanes extend inwardly for a relatively short distance so as to terminate outside of the fuel nozzle, leaving a wide orifice at the end of the conduit. As already indicated, the air stream 30 is given a whirling motion upon passing the inner radial vanes and when reaching the cylindercone -it encounters the outer vanes which are oppositely pitched. The result is a reversal in the whirling motion of the air adjacent its periphery of the cone as it issues from the conduit. The air stream closer to the center of the orifice issues therefrom still whirling in the direction in which motion was imparted by the inner vanes. The result is a discharge from the cone 40 orifice of air under pressure with a central whirl in one direction and an outer whirl in an opposite direction.

By reason of the inclined walls of the cone the outer whirling stream is deflected inwardly for 45 be found to be cleaner and hotter right from the start of operation.

I claim:

1. In an oil burner, the combination of a conduit having an open end, means for forcing air through the conduit, a fuel pipe axially positioned in the conduit, a discharge nozzle on the fuel pipe. adjacent the open end of the conduit, two sets of air deflecting vanes so positioned within the conduit as to produce at the open end' thereof oppositely whirling air streamsat unequal distances from the axis of the discharge nozzle of the fuel pipe, one set of vanes being positioned at the 'open end of the conduit and extending inwardly from a surrounding cone having an elongated base adapted to rest upon a wall of the conduit, and adjusting means extending from the cone base to a point remote from the open end of the conduit. v

2. In an oil burner, the combination of a conduit having an open end, means for forcing air through the conduit, a fuel pipe axially positioned in the conduit, a discharge nozzle on the fuel pipe adjacent the open end of the conduit, two sets of air deflecting vanes, oppositely pitched, and longitudinally spaced within the conduit to produce opposed whirls at different radial distances from 3. In an oil burner, the combination of a con-' duit having an open end, means for forcing air.

through the conduit, a fuel pipe axially positioned in theconduit, a discharge-nozzle on the fuel pipe adjacent the open end of the conduit, two sets of airdeflecting vanes so positioned within the conduit as to produce at the open end thereof oppositely whirling air streams proceeding from points at unequal distances from the axis of the discharge nozzle of the fuel pipe to- Ward each other for intermixture at substantially the point of fuel combustion, and means for adjusting one set of vanes toward or from the other set of vanes whereby to shift the intermixing point of the two opposing, whirling parts of the air stream.

HARRY H. BERRYMAN. 

